*{
    margin:0;
    padding:0;
    box-sizing: border-box;
}

.yiyan-container{
    width: 100vw;
    height: 100vh;
    background-size:cover;
    display:flex;
    justify-content:center;
    align-items:center;
}
.yiyan-container .mask{
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    position:absolute;
    left:0;
    top:0;
}

.yiyan-container .text{
    position:relative;
    z-index: 2;
    font-size: 30px;
    color:white;
}

.yiyan-container .author{
    text-align:right;
}

.center{
    padding: 10px 30px;
}
.left{
    text-align:left;
}
.right{
    text-align:right;
}